add the interface for global aggregator

git-svn-id: https://hyracks.googlecode.com/svn/branches/fullstack_staging@2061 123451ca-8445-de46-9d55-352943316053
7 files changed
tree: 5567e1a6721b7a84519d5167fc8f9a0daaee4013
  1. algebricks/
  2. hyracks/
  3. pom.xml
  4. pregelix/